Foren / Cotonti / General / Profile edit

I am trying to put a code to add an extra field but it does not show up.Here is the code I put.

                          </tr>   
                                <tr>        
                                        <td>{PHP.skinlang.usersprofile.Psnname}</td>   
                                        <td>{USERS_PROFILE_PSNNAME}</td>  

I edited the extra fields for users but it still won't show up.Help please.